RB Leipzig was paired against Olympique Marseille, despite RB Leipzig isn´t a club that wasn´t founded in DDR times there were many confrontations between East German clubs against French clubs in European competitions
1984-85 UEFA Cup Winners’ Cup Last 16: Dynamo Dresden vs FC Metz
1977-78 UEFA Cup 3rd round: 1.FC Magdeburg vs RC Lens
1990-91 UEFA Cup 2nd round: 1.FC Magdeburg vs Girondins de Bordeaux
1972-73 UEFA Cup 1st round: BFC Dynamo vs Angers
1987-88 European Cup 1st round: BFC Dynamo vs Girondins de Bordeaux
1989-90 European Cup 2nd round: BFC Dynamo vs AS Monaco
1983-84 UEFA Cup 1st round: 1.FC Lokomotive Leipzig vs Girondins de Bordeaux
1984-85 UEFA Cup Winners’ Cup semifinal: 1.FC Lokomotive Leipzig vs Girondins de Bordeaux
The following list of all the confrontations that CSKA has played until today against English clubs in European competitions
CSKA vs Chelsea in the 2004-05 UEFA Champions League group stage
CSKA vs Liverpool in the 2005 UEFA Supercup
CSKA vs Arsenal, 2005-06 UEFA Champions League group stage
CSKA vs Aston Villa, 2008-09 UEFA Cup Round of 32
CSKA vs Manchester United, 2009-10 UEFA Champions League group B
CSKA vs Manchester City, 2013-14 UEFA Champions League group D
CSKA vs Manchester United, 2015-16 UEFA Champions League group B
CSKA vs Tottenham Hotspur FC, 2016-17 UEFA Champions League group E
CSKA vs Manchester United, 2017-18 UEFA Champions League group A
All this teams are being the surprises in their respective domestic leagues, some of them are really close to win the title and others are very close to secure a European spot for next season (2018-19)
Lokomotiv Moskva are very near to secure the Russian title after long years of wait.
LASK Linz who promoted last season from the Erste Liga (2nd division) in which they won the title are making one of their best ever season in the Bundesliga and are 3rd now, securing a UEFA Europa League spot for next season.
Burnley, a modest team are doing the same in England and they even can climp one more place in the standings and finishing 5th also securing a place in the UEFA Europa League next season.